import java.util.Scanner;

public class homework01 {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.println("input your name:");
        String name = scanner.nextLine();
        System.out.println("input your last score:");
        int last_score = scanner.nextInt();
        System.out.println("input your this score:");
        int this_score = scanner.nextInt();
        double upgarde = 0.0;
        upgarde = ((double)this_score-(double)last_score)/last_score*100;
        System.out.printf("提高百分比：%.2f%%\n", upgarde);
    }
}
